Abstract: Ahstract Carex siderosticta Hance is a most spectacular member of the genus Carex. Its lateral flower-hoaring stems, sometimes distant from tbe vegeta- tive shoots with broad leaves, are ctriking even to someone familiar with the great variability in the genus Carex. It is distributcd in China (provinces: Heilongjiang, Liaoning, Jilin, Hebei, Shanxi, Shaanxi, Henan, Shandong, Zhejiang, Jiangxi), Japan, Korea and the Far East of USSR. In Beijing, the species is frequent in deciduous broad--leaved forests at 1200--l700 m above sea level. Carex siderosti- cta Hance, particularly its flower--bearing stems, were observed in the field. In early spring, early May in Beijing, the vegetative shoots aild flower--bearing stems with infundibuliform sheaths sprout almost simultaneously (Fig. 1 ). Most flower-bearing stems arise from the midst of decayed leaves of vegetative shoots of the previous year. In addition, some emerge directly from long creeping rhizome. However, the vegetative shoots neyer produce flower-bearing stems in the current year.

Key words: Carex siderosticta

摘要： 阔叶苔草Carex siderosticta Hance为东亚特产，分布于我国黑龙江、辽宁、吉林、河北、山西、陕西、河南、山东、浙江、江西诸省，以及日本、朝鲜和苏联远东地区。在北京，生长于附近山区(如百花山、东灵山、雾灵山、小五台山等)，海拔1200—1700m的落叶阔叶林下。其外形十分特异，非但其营养苗上具有很宽的叶片(宽可达3cm)，并从横长的根状茎上抽出花茎；花茎无叶，仅基部具管状叶鞘，一般远离营养苗，这种花茎被描述为“茎侧生”。它的奇异外貌，正如Raymond(1959)所说，足使苔草植物的专家，惊叹不已。由于它的奇异，我们细心观察了它的生长情况，尤其是它的花茎生长情况。兹将我们观察结果简要描述如下。

关键词: 阔叶苔草, 侧生茎, 假侧生茎, 中生茎